CN110481249B - Tire pressure slow air leakage detection method and tire pressure detection device - Google Patents
Tire pressure slow air leakage detection method and tire pressure detection device Download PDFInfo
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- CN110481249B CN110481249B CN201910762588.7A CN201910762588A CN110481249B CN 110481249 B CN110481249 B CN 110481249B CN 201910762588 A CN201910762588 A CN 201910762588A CN 110481249 B CN110481249 B CN 110481249B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
- B60C23/00—Devices for measuring, signalling, controlling, or distributing tyre pressure or temperature, specially adapted for mounting on vehicles; Arrangement of tyre inflating devices on vehicles, e.g. of pumps or of tanks; Tyre cooling arrangements
- B60C23/02—Signalling devices actuated by tyre pressure
- B60C23/04—Signalling devices actuated by tyre pressure mounted on the wheel or tyre
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
- B60C23/00—Devices for measuring, signalling, controlling, or distributing tyre pressure or temperature, specially adapted for mounting on vehicles; Arrangement of tyre inflating devices on vehicles, e.g. of pumps or of tanks; Tyre cooling arrangements
- B60C23/02—Signalling devices actuated by tyre pressure
- B60C23/04—Signalling devices actuated by tyre pressure mounted on the wheel or tyre
- B60C23/0408—Signalling devices actuated by tyre pressure mounted on the wheel or tyre transmitting the signals by non-mechanical means from the wheel or tyre to a vehicle body mounted receiver
- B60C23/0422—Signalling devices actuated by tyre pressure mounted on the wheel or tyre transmitting the signals by non-mechanical means from the wheel or tyre to a vehicle body mounted receiver characterised by the type of signal transmission means
- B60C23/0433—Radio signals
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
- B60C23/00—Devices for measuring, signalling, controlling, or distributing tyre pressure or temperature, specially adapted for mounting on vehicles; Arrangement of tyre inflating devices on vehicles, e.g. of pumps or of tanks; Tyre cooling arrangements
- B60C23/20—Devices for measuring or signalling tyre temperature only
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Abstract
A tire pressure slow air leakage detection method and a tire pressure detection device. A tire pressure slow air leakage detection method comprises the following steps: acquiring tire state data in real time and forming a tire pressure state table of the tire, wherein the tire state data comprises acquisition time, a current tire pressure value and a current tire temperature value matched with the current tire pressure value; acquiring a sampled tire temperature value adaptive to the sampled tire pressure value from a tire pressure state table based on the sampled tire pressure value; determining a current tire pressure value group which is adapted to the sampled tire temperature value in the tire pressure state table, wherein the difference value between the current tire temperature corresponding to the current tire pressure value in the current tire pressure value group and the sampled tire temperature value meets a preset temperature threshold value; and if the slow air leakage detection ratio is greater than a preset value, determining that the tire leaks slowly. The tire pressure slow air leakage detection method has the advantages that tire pressure slow air leakage is carried out, special detection equipment for detecting various environmental parameters is not required to be additionally arranged, development cost is not required to be additionally increased, and more accurate slow air leakage detection can be achieved.
Description
Technical Field
The invention relates to the field of vehicle detection, in particular to a tire pressure slow air leakage detection method and a tire pressure detection device.
Background
Because the tire is an important component of the automobile running mechanism, the tire not only bears the whole mass of the automobile, but also provides propelling force for the advancing of the automobile and plays a role in relieving the impact of the ground. The tire pressure monitoring system can monitor the tire in real time, remind a driver of paying attention to potential safety hazards which may appear, and play a role in preventing accidents in advance. At present, tire pressure monitoring systems of the Yingfei SP37 series, the Feichal FXTH871 series, the TI TPIC82000 series and the like are mainly available in the market, and all schemes can monitor key parameters of the tire such as pressure, temperature, acceleration and the like and transmit the parameters through high-frequency radio waves (RF). The conventional passenger vehicle sequentially reads the Identification (ID) of the tire monitoring module at the corresponding position by using a low-frequency matching tool and stores the identification in the matching tool, and then the ID is written into an Electronic Control Unit (ECU) through connection of a wire harness and a diagnosis port of the passenger vehicle or the matching tool is sent to the ECU through RF (radio frequency), so that each tire of the passenger vehicle is positioned and managed.
The tire pressure monitoring system mainly comprises two parts, wherein one part of the sensor is arranged in the tire and can be fixed on a wheel hub through an inflating valve, so that the temperature, the pressure and the acceleration of the tire can be monitored in real time. The second part is a receiver which is arranged at a position (some parts are directly displayed by a meter) which is easy to be observed by a driver in a cab, and can display the current tire pressure, temperature and fault condition so that the driver can know the condition of the tire. The sensor and the receiver are in signal transmission through high-frequency wireless signals. The sensor arranged in the tire can continuously measure the pressure and the temperature of the tire, and can judge whether the tire is air-leaked or not through analysis; if the tire is flat, the result is sent to a receiver through a high-frequency wireless signal, and the receiver reminds a driver of the tire failure in an audible and visual alarm mode. However, the above solution has a good judgment on quick tire leakage, but when the tire is leaked slowly, the damage is large and the leakage is easy to occur.
The co-generation automotive electronics limited company 201010572341.8 discloses a method for detecting tire leakage, which detects a pressure value and a temperature value of a tire once every set interval time T; judging whether the pressure value of the tire detected for N times continuously decreases every time, wherein in the N times of detection, the accumulated pressure decrease value of the tire is larger than a set threshold value; recording the last temperature and pressure values before the pressure value of the tire is reduced for the first time as T0 and P0 respectively, recording the temperature and pressure values of the tire detected for the Nth time as TN and PN respectively, and judging whether TN- (T0 multiplied by PN/P0) is more than or equal to 5 or not; if the pressure value of the tire continuously detected for N times is continuously reduced every time, and the accumulated pressure reduction value of the tire is larger than the set threshold value in the N times of detection, and TN- (T0 xPN/P0) is larger than or equal to 5, the tire is judged to be flat. The invention can effectively solve the problem of false alarm of the tire air pressure monitoring system on the air leakage of the tire, so that the alarm is more accurate. However, the above solution does not consider that the tire pressure value changes due to possible changes of the external temperature, for example, the vehicle continuously travels to a low temperature area or the outdoor air temperature continuously drops, thereby easily causing a false alarm problem of tire leakage.
The Chongqing Changan auto, Inc. at 201710264200.1 discloses a method for detecting slow air leakage of a tire, which includes the steps of setting a reference tire pressure, calculating a compensation tire pressure, and determining whether air is slowly leaked according to a slow air leakage standard. The detection method can judge whether the tire has slow air leakage or not under the condition of eliminating the influence of environment, working conditions and the like on the tire pressure, and meanwhile, the detection cost is prevented from being improved. Although the scheme considers the influence of various environments, working conditions and the like on the tire pressure, the step arrangement is extremely complicated, for example, judgment of at least more than 15 steps is carried out, and therefore the slow air leakage detection scheme of the tire is complicated in steps and has no feasibility of implementation.
Disclosure of Invention
The invention aims to provide a tire pressure slow air leakage detection method to solve the technical problems of complex realization and false alarm caused by no consideration of temperature change.
A tire pressure slow air leakage detection method comprises the following steps:
acquiring tire state data in real time and forming a tire pressure state table of the tire, wherein the tire state data comprises acquisition time, a current tire pressure value and a current tire temperature value matched with the current tire pressure value;
acquiring a sampled tire temperature value adaptive to the sampled tire pressure value from the tire pressure state table based on the sampled tire pressure value;
determining a current tire pressure value group which is adapted to the sampled tire temperature value in the tire pressure state table, wherein the difference value between the current tire temperature corresponding to the current tire pressure value in the current tire pressure value group and the sampled tire temperature value meets a preset temperature threshold value;
and if the slow air leakage detection ratio is greater than a preset value, determining that the tire leaks slowly.
A tire pressure slow air leakage detection method comprises the following steps:
acquiring tire state data in real time and forming a tire pressure state table of the tire, wherein the tire state data comprises acquisition time, a current tire pressure value and a current tire temperature value matched with the current tire pressure value;
acquiring a sampled tire temperature value adaptive to the sampled tire pressure value from the tire pressure state table based on the sampled tire pressure value;
determining a current tire pressure value group which is adapted to the sampled tire temperature value in the tire pressure state table, wherein the difference value between the current tire temperature corresponding to the current tire pressure value in the current tire pressure value group and the sampled tire temperature value meets a preset temperature threshold value;
and if the slow air leakage detection reference value continuously drops, determining that the tire is slow air leakage.
Compared with the prior art, the invention has the following advantages:
firstly, in the experiment of tire pressure slow air leakage detection, the applicant finds that the tire pressure values with the same tire temperature value or the tire temperature values in a smaller range are sampled for a period of time through multiple times of verification, and the tire pressure values at corresponding moments in the sampling time are basically the same or are in a small difference range. If slow gas leakage occurs, the tire pressure of the tire can become a descending trend, or the difference value or the ratio value can exceed a preset range, the tire pressure slow gas leakage is carried out in the mode, special detection equipment for detecting various environmental parameters is not required to be additionally arranged, a plurality of steps are not required to be additionally arranged (development cost is not required to be additionally increased for the existing receiver), more accurate slow gas leakage detection can be realized, and the detection accuracy is improved.
Secondly, the method does not need to occupy the existing tire pressure data acquisition time period for detection, and only needs to be triggered when the vehicle is flamed out or restarted, for example, when the vehicle is ignited each time, the receiver firstly triggers the tire pressure slow air leakage detection process, if the tire pressure slow air leakage detection process is not leaked, the receiver stops, if the tire pressure slow air leakage process is leaked, the tire pressure slow air leakage processing process is started (if a sound alarm occurs or related personnel pass), the hidden danger is detected at the first time before the vehicle runs, and the safety of the vehicle running is improved. Moreover, when the vehicle is shut down or restarted, some items (such as pairing, initialization and the like) need to be done, the tire pressure slow air leakage detection does not occupy the existing data acquisition reporting period, and the effect of better resource allocation is achieved.
And thirdly: when the tire pressure of special vehicles such as racing cars is detected at a low speed, the detection steps are few, the speed is high, the method is just suitable for the detection of the special vehicles, and the data can be recorded and tracked, so that the development of various subsequent large data analysis works is facilitated.
Drawings
Fig. 1 is a schematic view illustrating a remote real-time tire pressure monitoring system for a vehicle according to the present invention;
FIG. 2 is a schematic flow chart of a first tire pressure slow leak detection method;
FIG. 3 is a flow chart of an example of a first tire pressure slow leak detection method;
FIG. 4 is a schematic flow chart of a second tire pressure slow leak detection method;
fig. 5 is a flowchart of an example of a second tire pressure slow leak detection method.
Detailed Description
The present invention will be described in detail below with reference to the accompanying drawings.
Examples
Please refer to fig. 1, which is a schematic diagram of a remote real-time tire pressure monitoring system for a vehicle. The vehicle monitoring system comprises at least one vehicle monitoring device for obtaining real-time data of tires, at least one vehicle terminal processing and displaying module 13 and a cloud monitoring center 14. Wherein:
the vehicle monitoring device may be mounted on a trolley and includes at least one tire real-time data collector 11 and at least one receiver 12 for each tire of the vehicle. The prior vehicle takes four-wheel drive as an example, and generally four tires work during running. Therefore, the number of the tire real-time data collectors 11 may be four, and one tire real-time data collector 11 is provided for each tire. The Tire real-time data collector 11 may use the existing ZUS external stsm (smart Tire Safety monitor). That is, the tire real-time data collector may be a tire pressure sensor, and the tire pressure sensor is installed at a tire valve of a corresponding tire.
The above is only an example, the sensor is one for each wheel, and has two types of external and internal, and the appearance is small and compact, but the air pressure detection device, the wireless transmission device and the long-life battery unit are generally embedded in the sensorYuan. The external sensor is arranged on the tire valve, the operation is very simple, and basically, the external sensor can be installed by a user buying the external sensor. The built-in sensor is installed in the tire, the tire needs to be detached, dynamic balance needs to be carried out after the built-in sensor is installed, the process is relatively troublesome, and the built-in sensor is a mature product. The built-in sensor can accurately sense the air pressure and temperature change of the tire basically, and the common error can be controlled to be about 0.1Bar and 2 ℃. The external sensor is communicated with the air pressure and the air temperature inside the tire by virtue of the inflating valve, and is influenced by the external environment, and the precision of the external sensor can generally reach 90% or more of that of the internal sensor. The above tire pressure sensors are merely illustrative.
The remote real-time tire pressure monitoring system applied to the racing car generally arranges the sensor on the external inflating valve to facilitate quick arrangement in the process of racing, considering the particularity of the racing car in the process of replacing the tire. In addition, the speed of the racing car is relatively fast during the running process, so that the temperature of the tyre of the racing car is easy to rise during the running process, and similarly, the sensor and related parts on the inflating valve are generally made of high-temperature resistant materials.
The receiver 12 is independently developed by the company, and is configured to receive raw data transmitted by each tire real-time data collector during the running of the vehicle through an RF short-distance radio frequency communication manner, process the raw data of different tires into current tire data (the current tire data includes and is not limited to tire pressure, tire temperature, air leakage, and battery information) representing the current state of all running tires in units of vehicles, and upload compressed data packets indicating the current tire data of the vehicle in a period of several seconds or several minutes.
The receiver 12 can be made very small, the data transmission mode between the receiver and each sensor can be an RF radio frequency mode, the data transmission can be carried out with an upper computer (such as a vehicle end processing and displaying module 13 or a communication terminal where the vehicle end processing and displaying module is located) by using low-power consumption Bluetooth, the receiver can be designed into the shape of the existing receiver, a cigarette lighting interface arranged in a vehicle, or the receiver can be a receiver or a vehicle intelligent device integrated with the function of the receiver. The receiver can be plugged and arranged on a cigarette lighting interface in the vehicle.
The receiver may include a control chip, an RF short-range radio frequency module, a wireless communication unit, an in-vehicle communication unit including a USB interface, and a storage unit. The wireless communication unit is mainly a bluetooth module which interacts with an upper computer (generally, a terminal where the vehicle-end processing and displaying module 13 is located). The USB interface is used for updating software in the control chip or supplying power to the external charging unit through the USB interface. The terminal where the vehicle-end processing and displaying module 13 is located may include a user terminal, such as a terminal device like a smart phone or a tablet computer. The wireless communication unit may enable connection with the terminal based on a wireless communication technology. For example, the wireless communication unit may be a bluetooth unit, i.e., the wireless communication unit communicates with the terminal based on bluetooth technology; alternatively, the wireless communication unit may be a WiFi unit, that is, the wireless communication unit communicates with the terminal based on WiFi technology; or, the wireless communication unit may be a Zigbee unit, that is, the wireless communication unit implements communication with the terminal based on Zigbee technology; of course, the wireless communication unit may also be a structure supporting other communication technologies or communication protocols, and is not limited herein.
The wireless communication unit may be implemented by an Application-specific integrated circuit (ASIC), a Field-Programmable Gate array (FPGA), other Programmable logic devices, a discrete Gate or transistor logic device, a discrete hardware component, and the like, which are not limited herein. The wireless communication unit can also be used for receiving other instructions sent by the terminal, analyzing the instructions according to the communication protocol, and sending the analyzed instructions to the control chip so as to be further processed by the control chip.
For example, the identity information of the tire pressure sensor may include one or more of an identification of the tire pressure sensor, installation location information of the tire pressure sensor, and the like, which is not limited herein. The identifier of the tire pressure sensor may be a unique identifier for characterizing one tire pressure sensor, or a programmable identifier of the tire pressure sensor, which is not limited herein. For example, the installation location information of the tire pressure sensor may be used to characterize that the tire pressure sensor is installed in a front left tire, a front right tire, a rear left tire, a rear right tire, or the like of the vehicle. The updating of the identity information of the tire pressure sensor by the control chip may be updating one or more kinds of information in the identity information, which is not limited herein. In one scenario, if the tire pressure sensor on the vehicle needs to be replaced, the terminal may receive the identity information of the replaced tire pressure sensor, which is input by the user, for example, the identifier of the tire pressure sensor. Specifically, a correspondence table between the identifier of the tire pressure sensor and the installation position information may be pre-established, and the identifier of the tire pressure sensor may be updated according to the correspondence table.
The control chip may be implemented by a processor, a controller, a Central Processing Unit (CPU), an application specific integrated circuit, a field programmable gate array or other programmable logic device, discrete gate or transistor logic, discrete hardware, or the like, and is not limited herein.
The control chip pairs the received tire pressure sensor identifications of the tires, for example, the identifications can not only identify whether the tire pressure sensors belong to the tire pressure sensors belonging to the vehicle, but also pair position information of one of the left front tire, the right front tire, the left rear tire and the right rear tire of the vehicle where the tire pressure sensors are installed. In addition, the real-time original data of the tire pressure sensor is analyzed and stored after being processed, the data are processed into compressed data packets according to a preset data format, and the compressed data packets which are uploaded in a second or a plurality of seconds or minutes or a plurality of minutes and indicate the current tire data of the vehicle are uploaded.
Specifically, the storage unit may store the identity information of the tire pressure sensor sent by the control chip, and set a plurality of data tables for the tire pressure sensor as a unit, where each data table stores real-time data of the tire, such as tire pressure, tire temperature, whether air is leaking, and battery information.
In an integrated circuit, a circuit without a physical form and having a storage function is also called a storage unit, such as a RAM (Random Access Memory), a FIFO (First Input First Output, First in First out) Memory, and the like; in the system, the storage device in physical form is also called a storage unit, such as a memory bank, a memory card, and the like.
The receiver may also include an in-vehicle communication unit. The vehicle-mounted communication unit is realized by a field bus interface, an RS232 interface, a serial interface or the like. Of course, the vehicle-mounted communication unit may also include other implementation manners, for example, the vehicle-mounted communication unit is a wireless interface, and the vehicle-mounted communication unit may implement wired connection or wireless connection with the vehicle-mounted display device, which is not limited herein.
The present invention provides the principle of a first tire pressure slow air leakage detection method, which comprises (shown in fig. 2):
s11, acquiring tire state data in real time and forming a tire pressure state table, wherein the tire state data comprise acquisition time, a current tire pressure value and a current tire temperature value matched with the current tire pressure value;
s12, acquiring a sampled tire temperature value adaptive to the sampled tire pressure value from the tire pressure state table based on the sampled tire pressure value;
s13, determining a current tire pressure value group which is adapted to the sampled tire temperature value in the tire pressure state table, wherein the difference value between the current tire temperature corresponding to the current tire pressure value in the current tire pressure value group and the sampled tire temperature value meets a preset temperature threshold value;
and S14, if the slow air leakage detection ratio is (the highest tire pressure value in the current tire pressure value set-the sampled tire pressure value)/the highest tire pressure value, and the slow air leakage detection ratio is greater than a preset value, determining that the tire leaks air slowly.
In step S12, the last tire pressure record that is not used as the sampled tire pressure value is found from the tire pressure state table, the tire pressure value corresponding to the record is used as the sampled tire pressure value, and the tire temperature value corresponding to the record is the sampled tire temperature value adapted to the sampled tire pressure value.
In step S13, a current tire pressure value group in the tire pressure state table, which is adapted to the sampled tire temperature value, is determined, where the adaptation means that a difference between a current tire temperature corresponding to a current tire pressure value in the current tire pressure value group and the sampled tire temperature value satisfies a preset temperature threshold.
Steps S11 and steps S12-S14 may be two separate parallel processing procedures, and step S11 may acquire tire condition data in real time in a minute or second period. And steps S12-S14 may be a triggered slow tire leak detection process. For example, a tire slow leak detection process is triggered once per ignition. The special detection equipment for detecting various environmental parameters is not required to be additionally arranged, a plurality of steps are not required to be additionally arranged (development cost is not required to be additionally increased for the existing receiver), more accurate slow-speed air leakage detection can be realized, and the detection accuracy is improved.
For more clarity, the present invention provides an example of a first tire-pressure slow-rate air-leak detection method (shown in fig. 3) based on the above-described system. It should be noted that the following steps can be sent from different components, and the core of this example lies in the steps and flow of the processing, and the component that issues the instruction is only an example, and is not a limitation of the present invention. Examples of this include:
and S110, the receiver receives real-time tire pressure information including a tire pressure value and a tire temperature value transmitted by at least one sensor and stores the real-time tire pressure information in a tire pressure state table, wherein the record in the table includes corresponding data information including a collection time point, a current tire pressure value and a tire temperature value.
And S120, the receiver starts a slow air leakage detection process periodically or in an event triggering mode:
s121, obtaining a sampled tire pressure value from a tire pressure state table, and finding a tire temperature value corresponding to a record of the sampled tire pressure value;
s122, finding all records or partial records which are the same as the tire temperature value or have temperature difference meeting the preset temperature threshold value in the tire pressure state table to form a current tire pressure value group corresponding to the temperature value;
and S123, finding the highest tire pressure value from the current tire pressure value set, determining that the tire has the possibility of slow air leakage when the slow air leakage detection ratio is larger than a certain threshold value, and determining the slow air leakage detection ratio as (the highest tire pressure value-the sampled tire pressure value)/the highest tire pressure value.
The receiver event-triggered initiation of the slow leak detection process further comprises: the receiver is plugged into the cigarette lighter interface, and when the vehicle is detected to be flamed out or restarted, the receiver starts slow-speed air leakage detection in a triggering mode.
Obtaining the sampled tire pressure value from the tire pressure state table further comprises: the tire pressure state table finds the last tire pressure record which is not used as the sampled tire pressure value, and the tire pressure value corresponding to the record is used as the sampled tire pressure value. Namely, the sampled tire pressure value can take the last tire pressure value as the sampled tire pressure value, and when the last tire pressure value is the sampled tire pressure value, the latest real-time tire pressure value is found from the real-time tire pressure values which are not taken as the sampled tire pressure value and taken as the tire pressure value. Step S122 further includes: finding all records which are the same as the tire temperature value or have temperature difference meeting the preset temperature threshold (for example, the temperature difference is within the range of 3 degrees) within preset days in the tire pressure state table; and forming the current tire pressure value group by all the records, wherein each record further comprises a collection time point, a current tire pressure value and a tire temperature value, and identification information of whether the over-sampled tire pressure value is made. Thus, it is easier and more convenient to obtain the sampled tire pressure value.
And when the slow air leakage detection ratio is detected to be larger than a certain threshold value, repeating S121-S123, and when the repeated times are the threshold value N, if the slow air leakage detection ratio is larger than the certain threshold value every time, or the times that the slow air leakage detection ratio is larger than the certain threshold value are larger than the preset M times, determining that the tire has the possibility of slow air leakage. The threshold is an empirical value, in this example 15%. For example, if ten slow leak detection ratios are sampled within one week, and the number of times that the slow leak detection ratio is greater than a certain threshold value is greater than 7, the tire may have a possibility of slow leak. In general, M should be less than or equal to the value of N.
Step S123 further includes: storing the slow air leakage detection ratio of each time; step S121 further includes: after finding the tire temperature value corresponding to the record of the sampled tire pressure value, obtaining a current tire pressure value group corresponding to the tire temperature value, and judging whether the last calculated K slow air leakage detection ratios continuously rise or the tire pressure value continuously falls at the same tire temperature, if so, the tire has the possibility of slow air leakage (for example, the K value can be the sampling point value number of the span within seven days).
After multiple times of verification, the tire pressure values at the corresponding moments in the sampling time are basically the same or within a small difference range. If slow gas leakage occurs, the tire pressure of the tire can become a descending trend, or the difference value or the ratio value can exceed a preset range, the tire pressure slow gas leakage is carried out in the mode, special detection equipment for detecting various environmental parameters is not required to be additionally arranged, a plurality of steps are not required to be additionally arranged, and the detection is fast and high in precision.
A tire pressure slow air leakage detection device comprises the receiver and at least one sensor for uploading real-time tire state data, wherein the receiver further comprises a control chip and a memory, and the memory further comprises:
tire pressure state table: the real-time tire pressure information including the tire pressure value and the tire temperature value of the tire is stored, and the corresponding data information including the acquisition time point, the current tire pressure value and the tire temperature value is recorded in the table
The current tire pressure value set is as follows: all records or partial records which are the same as the record used for storing the tire temperature value or the temperature difference meets the preset temperature threshold value, wherein the records comprise the tire temperature value and the tire pressure value corresponding to the record;
the control chip further comprises:
a real-time data processing unit: the real-time tire pressure information receiving and storing device is used for receiving and storing real-time tire pressure information including a tire pressure value and a tire temperature value which are uploaded by a sensor and storing the real-time tire pressure information in a tire pressure state table;
slow leak detection unit: for periodically or event-triggered initiation of the slow leak detection process: obtaining a sampled tire pressure value from a tire pressure state table, and finding a tire temperature value corresponding to a record of the sampled tire pressure value; finding all records or partial records which are the same as the tire temperature value or have temperature difference meeting the preset temperature threshold value in a tire pressure state table to form a current tire pressure value group corresponding to the temperature value; finding the highest tire pressure value from the current tire pressure value set, determining that the tire has the possibility of slow air leakage if the slow air leakage detection ratio is larger than a certain threshold value, and sampling the tire pressure value/the highest tire pressure value if the slow air leakage detection ratio is larger than the threshold value.
The slow leak detection unit further includes:
a sampling point collection subunit: the tire temperature value recording device is used for obtaining a sampled tire pressure value from a tire pressure state table and finding a tire temperature value corresponding to a record of the sampled tire pressure value;
the current tire pressure value group constitutes a subunit: the tire pressure state table is used for finding all records or part of records which are the same as the tire temperature value or have temperature difference meeting the preset temperature threshold value in the tire pressure state table to form a current tire pressure value group corresponding to the temperature value;
a slow leakage detection ratio value operator unit: the tire pressure monitoring system is used for finding the highest tire pressure value from the current tire pressure value set and calculating a slow air leakage detection ratio, wherein the slow air leakage detection ratio is (the highest tire pressure value-the sampled tire pressure value)/the highest tire pressure value;
a comparison subunit: and comparing the slow air leakage detection ratio with a threshold, if the slow air leakage detection ratio is greater than a certain threshold, determining that the tire has the possibility of slow air leakage, and if not, finishing the slow air leakage detection.
The slow leak detection unit further includes:
a falling tendency judgment subunit: and the method is used for judging whether the last calculated K slow air leakage detection ratios continuously rise or whether the tire pressure value continuously falls under the same tire temperature, if so, the tire has the possibility of slow air leakage, and if not, the slow air leakage detection is finished.
The invention provides a second tire pressure slow air leakage detection method, which comprises the following principles (shown in figure 4):
s21, acquiring tire state data in real time and forming a tire pressure state table, wherein the tire state data comprise acquisition time, a current tire pressure value and a current tire temperature value matched with the current tire pressure value;
s22, acquiring a sampled tire temperature value adaptive to the sampled tire pressure value from the tire pressure state table based on the sampled tire pressure value;
s23, determining a current tire pressure value group which is adapted to the sampled tire temperature value in the tire pressure state table, wherein the difference value between the current tire temperature corresponding to the current tire pressure value in the current tire pressure value group and the sampled tire temperature value meets a preset temperature threshold value;
and S24, if the slow air leakage detection reference value is (sampled tire pressure value/reference tire pressure value) or (sampled tire pressure value-reference tire pressure value), determining that the tire has slow air leakage if the slow air leakage detection reference value continuously drops, wherein the reference tire pressure value is a preset value or an average tire pressure value in the tire pressure value group.
The reference tire pressure value can be obtained through experimental data to obtain a reference tire pressure value adaptive to a certain specific temperature difference range. Alternatively, the reference tire pressure value is the tire pressure average value in the tire pressure value group, and the tire pressure average value after the abnormal tire pressure value is removed may be also used.
Based on the disclosed system, the present invention provides a second example of a tire pressure slow leak detection method. (shown in fig. 5), which comprises:
s210, a receiver receives real-time tire pressure information including a tire pressure value and a tire temperature value, which is transmitted by at least one sensor, and stores the real-time tire pressure information in a tire pressure state table, wherein records in the table include corresponding data information including an acquisition time point, a current tire pressure value and a tire temperature value;
and S220, the receiver periodically or in an event triggering mode starts a slow air leakage detection process:
s221, obtaining a sampled tire pressure value from a tire pressure state table, and finding a tire temperature value corresponding to a record of the sampled tire pressure value;
s222, finding all records or partial records which are the same as the tire temperature value or have temperature difference meeting the preset temperature threshold value in a tire pressure state table to form a current tire pressure value group corresponding to the temperature value;
s223, storing a slow air leakage detection reference value in the current tire pressure value group, wherein the slow air leakage detection reference value is a sampled tire pressure value/a reference tire pressure value or a sampled tire pressure value-a reference tire pressure value;
s224, judging whether the slow air leakage detection reference value of the latest X times in the current tire pressure value group continuously decreases or not, if so, judging that the tire has the possibility of slow air leakage.
The slow air leakage detection reference value for X times in step S224 should include at least 7 days of slow air leakage detection process. If the air leakage occurs at a low speed, the tire pressure of the tire can become a descending trend, the air leakage at the low speed of the tire pressure is carried out in the mode, special detection equipment for detecting various environmental parameters is not required to be additionally arranged, a plurality of steps are not required to be additionally arranged, and the detection is rapid and high in precision.
The receiver event-triggered initiation of the slow leak detection process further comprises: the receiver is plugged into the cigarette lighter interface, and when the vehicle is detected to be flamed out or restarted, the receiver starts slow-speed air leakage detection in a triggering mode.
Step S222 further includes: finding all records which are the same as the tire temperature value or have temperature difference meeting the preset temperature threshold value within preset days in a tire pressure state table; and forming the current tire pressure value group by all the records, wherein each record further comprises a collection time point, a current tire pressure value and a tire temperature value, and identification information of whether the over-sampled tire pressure value is made. Obtaining the sampled tire pressure value from the tire pressure state table further comprises: the tire pressure state table finds the last tire pressure record which is not used as the sampled tire pressure value, and the tire pressure value corresponding to the record is used as the sampled tire pressure value. The above is merely an example, and the sampled tire pressure value may also be sampled at several time points, for example, the sampled tire pressure value is found forward at several time points from the last real tire pressure value as a reference point.
Correspondingly, the tire pressure slow air leakage detection device comprises a receiver and at least one sensor used for uploading real-time tire state data, wherein the receiver further comprises a control chip and a memory, and the memory further comprises:
tire pressure state table: the real-time tire pressure information including the tire pressure value and the tire temperature value of the tire is stored, and the corresponding data information including the acquisition time point, the current tire pressure value and the tire temperature value is recorded in the table
The current tire pressure value set is as follows: all records or partial records which are the same as the record used for storing the tire temperature value or the temperature difference meets the preset temperature threshold value, wherein the records comprise the tire temperature value and the tire pressure value corresponding to the record;
the control chip further comprises:
a real-time data processing unit: the real-time tire pressure information receiving and storing device is used for receiving and storing real-time tire pressure information including a tire pressure value and a tire temperature value which are uploaded by a sensor and storing the real-time tire pressure information in a tire pressure state table;
slow leak detection unit: for periodically or event-triggered initiation of the slow leak detection process: obtaining a sampled tire pressure value from a tire pressure state table, and finding a tire temperature value corresponding to a record of the sampled tire pressure value; finding all records or partial records which are the same as the tire temperature value or have temperature difference meeting the preset temperature threshold value in a tire pressure state table to form a current tire pressure value group corresponding to the temperature value; storing a slow air leakage detection reference value in the current tire pressure value set, wherein the slow air leakage detection reference value is a sampled tire pressure value/a reference tire pressure value or a sampled tire pressure value-a reference tire pressure value; and judging whether the slow air leakage detection reference value of the latest X times in the current tire pressure value set continuously falls or not, if so, determining that the tire has the possibility of slow air leakage.
The slow leak detection unit further includes:
a sampling point collection subunit: the tire temperature value recording device is used for obtaining a sampled tire pressure value from a tire pressure state table and finding a tire temperature value corresponding to a record of the sampled tire pressure value;
the current tire pressure value group constitutes a subunit: the tire pressure state table is used for finding all records or part of records which are the same as the tire temperature value or have temperature difference meeting the preset temperature threshold value in the tire pressure state table to form a current tire pressure value group corresponding to the temperature value;
a slow leakage detection reference value operator unit: the system is used for calculating a slow air leakage detection reference value, wherein the slow air leakage detection reference value is a sampled tire pressure value/a reference tire pressure value or a sampled tire pressure value-a reference tire pressure value;
a comparison subunit: and the method is used for judging whether the slow air leakage detection reference value of the latest X times in the current tire pressure value set continuously falls or not, and if so, the possibility of slow air leakage exists in the tire.
It will be understood by those skilled in the art that all or part of the processes of the methods of the embodiments described above can be implemented by a computer program, which can be stored in one or more non-volatile computer-readable storage media, and can include the processes of the embodiments of the methods described above when executed. Any reference to memory, storage, database, or other medium used in the embodiments provided herein may include non-volatile and/or volatile memory, among others. Non-volatile memory can include read-only memory (ROM), Programmable ROM (PROM), Electrically Programmable ROM (EPROM), Electrically Erasable Programmable ROM (EEPROM), or flash memory. Volatile memory can include Random Access Memory (RAM) or external cache memory. By way of illustration and not limitation, RAM is available in a variety of forms such as Static RAM (SRAM), Dynamic RAM (DRAM), Synchronous DRAM (SDRAM), Double Data Rate SDRAM (DDRSDRAM), Enhanced SDRAM (ESDRAM), Synchronous Link DRAM (SLDRAM), Rambus Direct RAM (RDRAM), direct bus dynamic RAM (DRDRAM), and memory bus dynamic RAM (RDRAM).
Those skilled in the art will appreciate that the structures associated with the disclosed aspects are merely part of a structure and are not intended to define a device or components for which the disclosed aspects apply, and that a particular device may include more or less components than those shown, or may have some components combined, or may have a different arrangement of components. In one embodiment, the vehicle remote real-time tire pressure monitoring method provided by the application can be implemented in the form of a computer program, and the computer program can be run on upper general-purpose equipment or various intelligent vehicle terminals. The memory of the device may store various program modules constituting the apparatus, and the computer program constituted by the various program modules makes the processor execute the steps of the method for remotely monitoring the tire pressure in real time according to the various embodiments of the present application described in the present specification.
In one embodiment, a vehicle intelligent device is provided, which comprises a memory and a processor, wherein the memory stores a computer program, and the computer program causes the processor to execute the steps of the method for monitoring the tire pressure in real time.
In one embodiment, a computer readable storage medium is provided, in which a computer program is stored, which, when being executed by a processor, causes the processor to carry out the steps of the above-mentioned method for real-time monitoring of tire pressure. The steps of the real-time tire pressure monitoring method herein may be the steps in the real-time tire pressure monitoring methods of the various embodiments described above.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features. The present invention has been described in terms of specific examples, which are provided to aid understanding of the invention and are not intended to be limiting. For a person skilled in the art to which the invention pertains, several simple deductions, modifications or substitutions may be made according to the idea of the invention.
Claims (16)
1. A tire pressure slow air leakage detection method is characterized by comprising the following steps:
acquiring tire state data in real time and forming a tire pressure state table of the tire, wherein the tire state data comprises acquisition time, a current tire pressure value and a current tire temperature value matched with the current tire pressure value;
finding the last tire pressure record which is not sampled from the tire pressure state table, wherein the tire pressure value corresponding to the record is used as a sampled tire pressure value; namely, the sampled tire pressure value takes the last tire pressure value as the sampled tire pressure value, and when the last tire pressure value is the sampled tire pressure value, the latest real-time tire pressure value is found from the real-time tire pressure values which are not taken as the sampled tire pressure value and taken as the sampled tire pressure value;
acquiring a sampled tire temperature value adaptive to the sampled tire pressure value from the tire pressure state table based on the sampled tire pressure value;
determining a current tire pressure value group which is adapted to the sampled tire temperature value in the tire pressure state table, wherein the difference value between the current tire temperature corresponding to the current tire pressure value in the current tire pressure value group and the sampled tire temperature value meets a preset temperature threshold value;
the current tire pressure value set is: all records or partial records which are the same as the record used for storing the tire temperature value or the temperature difference meets the preset temperature threshold value, wherein the records comprise the tire temperature value and the tire pressure value corresponding to the record;
and if the slow air leakage detection ratio is greater than a preset value, determining that the tire leaks slowly.
2. The method of claim 1, further comprising:
the receiver is plugged into the cigarette lighter interface, and when the vehicle is detected to be flamed out or restarted, the receiver starts a tire slow air leakage detection process based on the sampled tire pressure value in a triggering mode.
3. The method of claim 1, wherein determining a current set of tire pressure values in the tire pressure state table that matches the sampled tire temperature value further comprises:
finding all records which are the same as the tire temperature value or have temperature difference meeting the preset temperature threshold value within preset days in a tire pressure state table;
and forming the current tire pressure value group by all the records, wherein each record further comprises a collection time point, a current tire pressure value and a tire temperature value, and identification information of whether the over-sampled tire pressure value is made.
4. The method of claim 1, further comprising:
storing the slow air leakage detection ratio of each time;
and judging whether the last calculated K slow air leakage detection ratios continuously rise or whether the tire pressure value continuously falls at the same tire temperature, if so, determining that the tire slowly leaks, and K is more than 2.
5. The method of claim 1, wherein the slow leak detection ratio is 15%.
6. A tire pressure slow air leakage detection method is characterized by comprising the following steps:
acquiring tire state data in real time and forming a tire pressure state table of the tire, wherein the tire state data comprises acquisition time, a current tire pressure value and a current tire temperature value matched with the current tire pressure value;
finding the last tire pressure record which is not sampled from the tire pressure state table, wherein the tire pressure value corresponding to the record is used as a sampled tire pressure value; namely, the sampled tire pressure value takes the last tire pressure value as the sampled tire pressure value, and when the last tire pressure value is the sampled tire pressure value, the latest real-time tire pressure value is found from the real-time tire pressure values which are not taken as the sampled tire pressure value and taken as the sampled tire pressure value;
acquiring a sampled tire temperature value adaptive to the sampled tire pressure value from the tire pressure state table based on the sampled tire pressure value;
determining a current tire pressure value group which is adapted to the sampled tire temperature value in the tire pressure state table, wherein the difference value between the current tire temperature corresponding to the current tire pressure value in the current tire pressure value group and the sampled tire temperature value meets a preset temperature threshold value;
the current tire pressure value set is: all records or partial records which are the same as the record used for storing the tire temperature value or the temperature difference meets the preset temperature threshold value, wherein the records comprise the tire temperature value and the tire pressure value corresponding to the record;
and if the slow air leakage detection reference value continuously drops, determining that the tire slowly leaks, wherein the slow air leakage detection reference value is (sampled tire pressure value/reference tire pressure value) or (sampled tire pressure value-reference tire pressure value), and the reference tire pressure value is a preset value or an average tire pressure value in the tire pressure value group.
7. The method of claim 6, wherein a slow leak in the tire is determined if there is a continuous decrease in the slow leak detection reference value for at least seven days.
8. The method of claim 6,
the receiver is plugged in the cigarette lighter interface, and when the vehicle is detected to be flamed out or restarted, the receiver is triggered to start and is based on the sampling tire pressure value and the tire slow air leakage detection.
9. The method of claim 6 or 8, wherein determining the current set of tire pressure values in the tire pressure state table that fit the sampled tire temperature value further comprises:
finding all records which are the same as the tire temperature value or have temperature difference meeting the preset temperature threshold value within preset days in a tire pressure state table;
and forming the current tire pressure value group by all the records, wherein each record further comprises a collection time point, a current tire pressure value and a tire temperature value, and identification information of whether the over-sampled tire pressure value is made.
10. The slow tire pressure air leakage detection device is characterized by comprising a receiver and at least one sensor for uploading real-time tire state data, wherein the receiver further comprises a control chip and a memory, and the memory further comprises:
tire pressure state table: the real-time tire pressure information including the tire pressure value and the tire temperature value of the tire is stored, and the records in the table include corresponding data information including an acquisition time point, the current tire pressure value and the tire temperature value;
finding the last tire pressure record which is not sampled from the tire pressure state table, wherein the tire pressure value corresponding to the record is used as a sampled tire pressure value; namely, the sampled tire pressure value takes the last tire pressure value as the sampled tire pressure value, and when the last tire pressure value is the sampled tire pressure value, the latest real-time tire pressure value is found from the real-time tire pressure values which are not taken as the sampled tire pressure value and taken as the sampled tire pressure value;
the current tire pressure value set is as follows: all records or partial records which are the same as the record used for storing the tire temperature value or the temperature difference meets the preset temperature threshold value, wherein the records comprise the tire temperature value and the tire pressure value corresponding to the record;
the control chip further comprises:
a real-time data processing unit: the real-time tire pressure information receiving and storing device is used for receiving and storing real-time tire pressure information including a tire pressure value and a tire temperature value which are uploaded by a sensor and storing the real-time tire pressure information in a tire pressure state table;
slow leak detection unit: for periodically or event-triggered initiation of the slow leak detection process: obtaining a sampled tire pressure value from a tire pressure state table, and finding a tire temperature value corresponding to a record of the sampled tire pressure value; finding all records or partial records which are the same as the tire temperature value or have temperature difference meeting the preset temperature threshold value in a tire pressure state table to form a current tire pressure value group corresponding to the temperature value; finding the highest tire pressure value from the current tire pressure value set, determining that the tire has the possibility of slow air leakage if the slow air leakage detection ratio is larger than a certain threshold value, and determining the slow air leakage detection ratio as (the highest tire pressure value-sampling tire pressure value)/the highest tire pressure value.
11. The apparatus of claim 10, wherein the slow leak detection unit further comprises:
a sampling point collection subunit: the tire temperature value recording device is used for obtaining a sampled tire pressure value from a tire pressure state table and finding a tire temperature value corresponding to a record of the sampled tire pressure value;
the current tire pressure value group constitutes a subunit: the tire pressure state table is used for finding all records or part of records which are the same as the tire temperature value or have temperature difference meeting the preset temperature threshold value in the tire pressure state table to form a current tire pressure value group corresponding to the temperature value;
a slow leakage detection ratio value operator unit: the tire pressure monitoring system is used for finding the highest tire pressure value from the current tire pressure value set and calculating a slow air leakage detection ratio, wherein the slow air leakage detection ratio is (the highest tire pressure value-the sampled tire pressure value)/the highest tire pressure value;
a comparison subunit: and comparing the slow air leakage detection ratio with a threshold value, and determining that the tire leaks slowly if the slow air leakage detection ratio is greater than a certain threshold value.
12. The apparatus of claim 11, wherein the slow leak detection unit further comprises:
a falling tendency judgment subunit: and the method is used for judging whether the last calculated K slow air leakage detection ratios continuously rise or whether the tire pressure value continuously falls at the same tire temperature, and if so, determining the slow air leakage of the tire.
13. The slow tire pressure air leakage detection device is characterized by comprising a receiver and at least one sensor for uploading real-time tire state data, wherein the receiver further comprises a control chip and a memory, and the memory further comprises:
tire pressure state table: the real-time tire pressure information including the tire pressure value and the tire temperature value of the tire is stored, and the records in the table include corresponding data information including an acquisition time point, the current tire pressure value and the tire temperature value;
finding the last tire pressure record which is not sampled from the tire pressure state table, wherein the tire pressure value corresponding to the record is used as a sampled tire pressure value; namely, the sampled tire pressure value takes the last tire pressure value as the sampled tire pressure value, and when the last tire pressure value is the sampled tire pressure value, the latest real-time tire pressure value is found from the real-time tire pressure values which are not taken as the sampled tire pressure value and taken as the sampled tire pressure value;
the current tire pressure value set is as follows: all records or partial records which are the same as the record used for storing the tire temperature value or the temperature difference meets the preset temperature threshold value, wherein the records comprise the tire temperature value and the tire pressure value corresponding to the record;
the control chip further comprises:
a real-time data processing unit: the real-time tire pressure information receiving and storing device is used for receiving and storing real-time tire pressure information including a tire pressure value and a tire temperature value which are uploaded by a sensor and storing the real-time tire pressure information in a tire pressure state table;
slow leak detection unit: for periodically or event-triggered initiation of the slow leak detection process: obtaining a sampled tire pressure value from a tire pressure state table, and finding a tire temperature value corresponding to a record of the sampled tire pressure value; finding all records or partial records which are the same as the tire temperature value or have temperature difference meeting the preset temperature threshold value in a tire pressure state table to form a current tire pressure value group corresponding to the temperature value; saving a slow air leakage detection reference value in the current tire pressure value set, wherein the slow air leakage detection reference value is (sampled tire pressure value/reference tire pressure value) or (sampled tire pressure value-reference tire pressure value); and judging the latest X times of slow air leakage detection reference values in the current tire pressure value set, and if the situation of continuous decline exists, determining the slow air leakage of the tire, wherein the reference tire pressure value is a preset value or the average tire pressure value in the tire pressure value set.
14. The apparatus of claim 13, wherein the slow leak detection unit further comprises:
a sampling point collection subunit: the tire temperature value recording device is used for obtaining a sampled tire pressure value from a tire pressure state table and finding a tire temperature value corresponding to a record of the sampled tire pressure value;
the current tire pressure value group constitutes a subunit: the tire pressure state table is used for finding all records or part of records which are the same as the tire temperature value or have temperature difference meeting the preset temperature threshold value in the tire pressure state table to form a current tire pressure value group corresponding to the temperature value;
a slow leakage detection reference value operator unit: the tire pressure monitoring system is used for calculating a slow air leakage detection reference value, wherein the slow air leakage detection reference value is (sampled tire pressure value/reference tire pressure value) or (sampled tire pressure value-reference tire pressure value);
a comparison subunit: and the method is used for judging whether the slow air leakage detection reference value of the latest X times in the current tire pressure value set continuously falls or not, and if so, the possibility of slow air leakage exists in the tire.
15. A readable storage medium storing a program which, when executed by a processor, causes the processor to perform the steps of the method according to any one of claims 1 to 8.
16. A vehicle smart device comprising a memory and a processor, the memory storing a program which, when executed by the processor, causes the processor to carry out the steps of the method according to any one of claims 1 to 9.
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| CN114088424B (en) * | 2020-06-30 | 2024-01-30 | 中车株洲电力机车研究所有限公司 | Wheel hub abnormality monitoring method and device |
| CN112265417A (en) * | 2020-09-30 | 2021-01-26 | 赛轮集团股份有限公司 | Off-highway giant tire slow air-spreading automatic detection method |
| CN112477529A (en) * | 2020-11-30 | 2021-03-12 | 浙江吉利控股集团有限公司 | Tire pressure compensation device, method and system |
| CN113547879A (en) * | 2021-08-17 | 2021-10-26 | 深圳市元征科技股份有限公司 | Tire leakage detection method and device, vehicle and computer storage medium |
| CN114872498A (en) * | 2022-05-17 | 2022-08-09 | 联合汽车电子有限公司 | Tire pressure prediction model establishing method, tire air leakage monitoring system and method |
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